The Wobbegong shark sank its razor-sharp teeth into his leg just below the knee and would not let go.
Senior lifeguard Michael Jones said he could not believe his eyes when Luke turned up bleeding with the 2 ft-long Wobbegong hanging off him.
JAWS: The Wobbegong shark left 70 wounds in Luke's leg
Marine expert Mr Paul Ashley, said: "In the wild wobbegongs give birth to 30 pups at a time and, had she stayed where she was, they would almost certainly have been snapped up by the other sharks as soon as they were born."
An ultrasound scan has shown that the Australian wobbegong shark, which lives at Blackpool Sea Life Centre in Lancashire, is expecting up to 20 pups.
Youngsters can enjoy incredibly close underwater encounters with everything from two-metre-long zebra sharks and black and white tip reef sharks to bamboo sharks, wobbegongs
and hundreds of brightly-coloured reef species like trigger fish and puffer fish.
The researchers determined that the studied sharks, in this case two wobbegong
species, are cone monochromats.